oracle col命令

oracle col命令可以对列进行进行格式化，格式：col 列名 for(mat) 格式

例如：

col owner for a100                设置owner列格式

col 列名：显示当前列的格式

SQL> col owner
COLUMN	 owner ON
FORMAT	 a100
SQL> 

clear column：清除所有列的格式

SQL> col owner for a100;
SQL> col owner
COLUMN	 owner ON
FORMAT	 a100
SQL> clear column;
columns 已清除
SQL> col owner
SP2-0046: COLUMN 'owner' 未定义
SQL> 

host hostname：查看主机名

SQL> host hostname
patrolagentSQL> 

help index：帮助

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